Office chair mechanism



FIG. 1 is a front elevation view of the office chair mechanism showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a front perspective view thereof; and,

FIG. 8 is a rear perspective view thereof.

The broken lines shown in the drawing represent portions of the office chair mechanism that form no part of the claimed design. 

CLAIM The ornamental design for an office chair mechanism, as shown and described. 